hankx7787 comments on Don't Build Fallout Shelters - Less Wrong
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The type of people who build fallout and other fortified shelters intuitively assign a rather high prior to at least one of the scenarios in which such a shelter is very useful unfolding in the near time frame, such as a few decades. This is far from the mainstream, but so is a similar time-frame estimate of cryonic revival or the Singularity, which are taken quite seriously here. If you give, say, 50-50 odds for a global disaster happening within 20 years or so, building a shelter becomes pretty rational. and the extra expense of making it radiation-resistant is probably small enough to be worth absorbing.
As for the "life will not be worth living" argument, having a shelter may make a difference between propagating your genes or perishing, and I suspect that the perceived importance of survival of one's bloodline correlates with other survivalist traits.
er, it's not anything about the "perceived importance of survival of one's bloodline" - it's about rebuilding civilization and trying again at the Singularity, and hopefully preserving as many people, cryonics patients, or whatever we best can, through the rough times. In a very worst-case scenario, reproduction could be a useful way to help carry on that mission beyond your own personal capabilities (which it already is in some ways).